chore: replace e2e env variables from server to data center

[zakisk]

this replaces all the env variables names from bitbucket server to data center.

📝 Description of the Change

🔗 Linked GitHub Issue

Fixes #

🧪 Testing Strategy

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• Not Applicable

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✅ Submitter Checklist

• 📝 My commit messages are clear, informative, and follow the project's How to write a git commit message guide. The Gitlint linter ensures in CI it's properly validated
• ✨ I have ensured my commit message prefix (e.g., fix:, feat:) matches the "Type of Change" I selected above.
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• 📖 I have added or updated documentation for any user-facing changes.
• 🧪 I have added sufficient unit tests for my code changes.
• 🎁 I have added end-to-end tests where feasible. See README for more details.
• 🔎 I have addressed any CI test flakiness or provided a clear reason to bypass it.
• If adding a provider feature, I have filled in the following and updated the provider documentation:
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[chmouel]

are you ready for the gh secret set and update infra repo?

[chmouel]

/lgtm

[pipelines-as-code]

Congrats @zakisk your PR Has been approved 🎉

✅ Pull Request Approved

Approval Status:

• Required Approvals: 1
• Current Approvals: 1

👥 Reviewers Who Approved:

Reviewer	Permission Level	Approval Status
@chmouel	admin	✅

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  directly if you have repository permission).

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[gemini-code-assist]

Code Review

This pull request renames environment variables related to Bitbucket Data Center from TEST_BITBUCKET_SERVER_* to TEST_BITBUCKET_DATA_CENTER_* across documentation, tests, and configuration files to improve naming consistency. I have no feedback to provide.